Holder for parting tool and shank



March 13, 1956 R. E. NovKov HOLDER FOR PARTING TOOL AND' SHANK FiledJuly 6, 1954 IN VEN TOR. RA YMOND E. NOVK OV @iufm T TORNE YS ,UnitedStates .HOLDER FOR PARTING TOOL AND SHANK Application Juiy 6, 1954,serial No. 441,305

4 claims. (ci. 29-96) 'I'his invention relates to parting tools, andespecially to 2,737,705 PatentedyMarrrlS, 1956.

engaging a rearuportion'of the parting tool, and a clamp l; blockremovably secured to the retainer block and having a novel holderadapted to position an inexpensive, eicient.-

1y utilized parting tool in a secure, replaceable manner for cutting orparting a work piece into a number of pieces.

`The general object of the present invention is to provide a new andimproved parting tool holder characterized by the solid, securepositioning of the parting tool and -by the ease of removal andsubsequent replacement of the parting tool in the same position as`previously occupied inthe tool holder.

Another object of the invention is to use a replaceable supportingplate-which is in special secure engagement with a retainer block andwhich plate has a positioning recess inits upper edge for accuratepositioning of a parting tool having a complementary shape to the recesson the support plate for engagement therewith.`

I VAfuither object of the invention is to use a backstop orshank memberseparate from a cutting tool to aid in positioning a cutting tool in itsholder.

Another object is to position a parting ,tool `so that Jsubstantiallythe entire tool can be used `as the tool ,wears away but with theparting tool being xedly and securely positioned at all times.

Yet another object of the invention lis to use a special clamp memberincombination with a support plate in a parting tool holder for clampingagainst bothA the upper and lower surfaces of va parting toolpositionedyin the holder. t Yet another object of the invention is toprovide a secure holder for a parting tool that extends or projectsappreciably from the main body or block of the holder an extension armor other portion engaging the parting tool and the shank to secure themon the support plate and to permitrelatively short parting tools to beused.

In the, following specification and the accompanying drawings,corresponding numerals are used to refer to corresponding parts to`facilitate comparison between the drawings and speciication. y y

In order to understand the invention in detail, attention now isdirected to the accompanying drawings and the partig tool holderof theinvention is indicated as a whole by the numeral 1. This partingtoolholder 1 includes a carrier, support or retainer block 2 of suitableconstruction for engagement with a conventional machine tool, such asthe turret of a turret lathe and this retainer block 2 is adapted toposition the remainder of the elements of the tool holder of theinvention thereon. The retainer block 2 has a` shallow recess 3 formedin one upper lateral Surface thereof and extending to a forward or frontmargin of the retainer block 2. The recess 3 also extends to an uppersurface ofthe retainer block 2 at the front end thereof whereas areduced height lower portion 3a is provided in thisrecess adjacent therear end thereof. A support plate 4, usually substantially of thethickness cort responding to Ythe depth of the recess 3 in the block 2,is

' for removable engagement with provided and is shaped complementary atthe rear portion thereof for engagement with therecesses 3 and 3a theretainer block 2 as hereinafter described.4 Y

It is an Yimportant feature ofthe invention that the support'plate 4extends forwardly from the retainer block 2 an appreciable distance andVthat the upper edge of the support plate 4 is provided with a specialshape which in this" instance comprises a V-shaped recess 5 formed inthe upper edgeof the support plate 4 and extending the total exposedlength thereof. The support plate 4 has a' reduced height back portion4a which engages the recess 3a in the block and the recess 5, of course,is not formed in such portion of the support plate.

The parting tool holder 1 is adapted to position a parting tool 6Vtherein, which tool usually is made from tungsten carbide or other veryhard metallic material for use in rapid and eiective cutting work with aminimum of maintenance or sharpening of the parting tool 6. It isimportant that the parting tool 6 have a lower surface but which canposition a relatively short tool therein .by v' 4 use of a shank memberengaging the tool. l The foregoing and other objects and advantages ofthe invention will be made more apparent as the specification proceeds.u For a better understanding of the present invention, reference shouldbe had to the accompanying drawings, wherein:

Fig. l is an elevation of 'a parting tool holder illustrat' ing thecurrently preferred embodiment of the principles of theinvention;

Fig. 2 is a plan View of the 1 taken on line 2-2 thereof; Fig. 3y isarfront end elevation of the parting tool holder ofFig. 1, with aportion of the holder broken away and parting tool holderof Fig.

shown in section for clarity to show the means for secur- Ving thesupporting plate in position; and Fig. 4 is a vertical section taken online 4--4 of Fig. I. The present invention, in general, relates to aparting tool holder including a retainer block, a support plate edge4Vengages such upper edge to be positionedthereby and protrude forwardlyfrom Athe support plate,"a" 'shank shaped complementary to the uppersurface of the support plate 4 so that the parting tool 6 is shown ashaving a V-shaped lower edge 7 which is seated in the recess 5 in theupper edge of the support plate. Hence the parting tool 6 is accuratelylocated laterally with relation to such support plate 4 andthe remainderof the parting tool holder 1.

As an important feature of the invention, it will be seen that theparting tool 6 has a section removed vfrom the rear portion thereof toprovidea reduced height part 14 on the tool. Such part 14 is adapted toregister with and engage an end 15 on a shank 1`6 provided to aid inpositioning the parting tool 6. Itwill be seen that the registering orengaging portions of the parting tool and the shank` 16V areirregular'in shape and engage to prevent any forward movement of thetool 6 with relationto the shank 16. In lthis instance, the end 15 is ofreduced height or size where secured to the shank 16 so that a wedgedengagement with the tool 6 is provided, In all events, the engagingportions of the parting tool' and shank arej'comi plementary toeachother and maybe considered to be in hooked engagement, whileobviously 'the main portions of. the parting tool and shank ,16, are ofthe same height and any desired intertting- 'seclltionscan be providedonthe tool and'shank. The lower edge ofthe'shank lpre'ferf ably iscomplementary in shape to the recess 5 in tli'esup

